---
** [tickets:#218] arm semihosting: target resumes after application exit**
**Status:** new
**Milestone:** 0.9.0
**Created:** Thu Jan 03, 2019 05:40 PM UTC by Joseph McLaughlin
**Last Updated:** Thu Jan 03, 2019 05:40 PM UTC
**Owner:** nobody
In release 0.10.0 when running the target in semihosted mode it was found that
a `wait_halt <ms>` command is not honored after the target app has run to
completion. By "run to completion" I mean that a semihosting op of 0x18
`angel_SWIreason_ReportException` has been requested by the target. The
following command works as expected in v0.9.0 but "hangs" in v0.10.0 until the
`wait_halt` timer expires:
`openocd -f openocd.cfg -c "program hello_world" -c 'arm semihosting enable' -c
'reset run' -c 'wait_halt 60000' -c 'shutdown'`
...assuming `hello_world` is a semihosted app that exits gracefully well before
the timer expiry.
It was found that this "hang" is likely due to the target being resumed in
`arm_semihosting()` after the `angel_SWIreason_ReportException` is processed.
It looks like some subtle logic may have been inadvertently removed between
v0.9.0 and v0.10.0. that prevented the target from resuming in this case.
This patch fixes the "hang", but not sure if it's an appropriate fix:
```
$ diff -u original/src/target/arm_semihosting.c patched/src/target
--- original/src/target/arm_semihosting.c 2016-12-25 09:12:55.000000000
-0500
+++ patched/src/target/arm_semihosting.c 2019-01-03 11:13:09.000000000
-0500
@@ -772,6 +772,10 @@
LOG_ERROR("Failed semihosting operation");
return 0;
}
+
+ // Early out if handling an exit request / exception report
+ if (arm->semihosting_op == 0x18)
+ return 1;
}
```
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